<template>
    <div class="type-nav">
        <div class="container" @mouseleave="sortMouseLeave">
            <h2 class="all" @mouseenter="showSort">全部商品分类</h2>
            <nav class="nav">
                <a href="###">服装城</a>
                <a href="###">美妆馆</a>
                <a href="###">尚品汇超市</a>
                <a href="###">全球购</a>
                <a href="###">闪购</a>
                <a href="###">团购</a>
                <a href="###">有趣</a>
                <a href="###">秒杀</a>
            </nav>
            <div class="sort" v-show="isShowSort">
                <div class="all-sort-list2" @click="toSearch">
                    <div class="item" v-for="(c1, index) in categoryList" :key="c1.categoryId"
                        :class="{ cur: currentIndex == index }">
                        <h3 @mouseenter="sortMouseEnter(index)">
                            <a :data-category="'category1Id:' + c1.categoryId">{{ c1.categoryName }}</a>
                        </h3>
                        <div class="item-list clearfix" :style="{ display: currentIndex == index ? 'block' : 'none' }">
                            <div class="subitem" v-for="(c2, index) in c1.categoryChild" :key="c2.categoryId">
                                <dl class="fore">
                                    <dt>
                                        <a :data-category="'category2Id:' + c2.categoryId">{{ c2.categoryName }}</a>
                                    </dt>
                                    <dd>
                                        <em v-for="(c3, index) in c2.categoryChild" :key="c3.categoryId">
                                            <a :data-category="'category3Id:' + c3.categoryId">{{ c3.categoryName }}</a>
                                        </em>

                                    </dd>
                                </dl>
                            </div>
                        </div>
                    </div>



                </div>
            </div>
        </div>
    </div>
</template>

<script>
import { mapState } from 'vuex';
import throttle from "lodash/throttle";  //节流
import debounce from "lodash/debounce";  //防抖
export default {
    name: 'TypeNav',
    data() {
        return {
            currentIndex: -1,
            isShowSort: true,
        }
    },
    mounted() {
        if (this.$route.path != "/home") {
            this.isShowSort = false;
        }
    },
    computed: {
        ...mapState({ //state是大仓库中的数据
            categoryList: state => state.home.categoryList
        })
    },
    methods: {
        sortMouseEnter: throttle(function (index) {  //节流，50毫秒执行一次
            this.currentIndex = index;
        }, 50),
        sortMouseLeave: debounce(function () {  //防抖，触发后50毫秒后执行，如果在50毫秒内又触发则重新计算
            this.currentIndex = -1;
            if (this.$route.path != "/home") {
                this.isShowSort = false;
            }


        }, 50),
        toSearch(event) { //跳转到search,
            let { category } = event.target.dataset;
            if (category) {
                var locations = {
                    name: "search",
                    query: { categoryName: event.target.innerText },
                };
                const [key, value] = category.split(':')
                locations.query[key] = value;
                if (this.$route.params.keyword) {
                    locations.params = this.$route.params;
                }
                this.$router.push(locations, resolve => { }, reject => { });  //编程式跳转
            }
        },
        showSort() {
            this.isShowSort = true
        }

    }
}
</script>

<style lang="less" scoped>
.type-nav {
    border-bottom: 2px solid #e1251b;

    .container {
        width: 1200px;
        margin: 0 auto;
        display: flex;
        position: relative;

        .all {
            width: 210px;
            height: 45px;
            background-color: #e1251b;
            line-height: 45px;
            text-align: center;
            color: #fff;
            font-size: 14px;
            font-weight: bold;
        }

        .nav {
            a {
                height: 45px;
                margin: 0 22px;
                line-height: 45px;
                font-size: 16px;
                color: #333;
            }
        }

        .sort {
            position: absolute;
            left: 0;
            top: 45px;
            width: 210px;
            height: 461px;
            position: absolute;
            background: #fafafa;
            z-index: 999;

            .all-sort-list2 {
                .item {
                    h3 {
                        line-height: 30px;
                        font-size: 14px;
                        font-weight: 400;
                        overflow: hidden;
                        padding: 0 20px;
                        margin: 0;

                        a {
                            color: #333;
                        }
                    }

                    .item-list {
                        display: none;
                        position: absolute;
                        width: 734px;
                        min-height: 460px;
                        background: #f7f7f7;
                        left: 210px;
                        border: 1px solid #ddd;
                        top: 0;
                        z-index: 9999 !important;

                        .subitem {
                            float: left;
                            width: 650px;
                            padding: 0 4px 0 8px;

                            dl {
                                border-top: 1px solid #eee;
                                padding: 6px 0;
                                overflow: hidden;
                                zoom: 1;

                                &.fore {
                                    border-top: 0;
                                }

                                dt {
                                    float: left;
                                    width: 54px;
                                    line-height: 22px;
                                    text-align: right;
                                    padding: 3px 6px 0 0;
                                    font-weight: 700;
                                }

                                dd {
                                    float: left;
                                    width: 415px;
                                    padding: 3px 0 0;
                                    overflow: hidden;

                                    em {
                                        float: left;
                                        height: 14px;
                                        line-height: 14px;
                                        padding: 0 8px;
                                        margin-top: 5px;
                                        border-left: 1px solid #ccc;
                                    }
                                }
                            }
                        }
                    }

                    // &:hover {
                    //     .item-list {
                    //         display: block;
                    //     }
                    // }
                }

                .cur {
                    background-color: skyblue;
                }

                // .item:hover {
                //     background-color: skyblue;
                // }
            }
        }
    }
}
</style>